Image Size Smaller than Recommended

I have two posts on my site that are driving me crazy!

Google keeps saying the image size is smaller than recommended yet those pages both have full size images that are easily big enough.

I have tried updating the page, duplicating the page by re-publishing from the AMP for WP editor yet still these two remain as errored.

I have many, many other pages on the site created exactly the same way with no problem at all.

Can you take a look to see where the problem is coming from?

https://diyvideoeditor.com/magix-video-deluxe-review/amp/
https://diyvideoeditor.com/nero-ai-video-upscaler-review/amp/

The page I need help with: [log in to see the link]